This bug was fixed in the package linux-riscv - 5.11.0-1004.4

---------------
linux-riscv (5.11.0-1004.4) hirsute; urgency=medium

  [ Ubuntu: 5.11.0-13.14 ]

  * CVE-2020-27170
    - bpf: Prohibit alu ops for pointer types not defining ptr_limit
    - bpf, selftests: Fix up some test_verifier cases for unprivileged
  * CVE-2020-27171
    - bpf: Fix off-by-one for area size in creating mask to left

 -- Andrea Righi <andrea.ri...@canonical.com>  Fri, 19 Mar 2021 18:21:28
+0100

** Changed in: linux-riscv (Ubuntu)
       Status: Incomplete => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-27170

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-27171

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https://bugs.launchpad.net/bugs/1917433

Title:
   riscv: revert SiFive Unleashed CPUFreq

Status in linux-riscv package in Ubuntu:
  Fix Released
Status in linux-riscv source package in Groovy:
  Fix Committed

Bug description:
  == SRU Justifcation Groovy/RISCV ==

  The SiFive Unleashed board with the current Ubuntu cpufreq default
  config can hang on boot with CPU freq enabled with the latest device
  tree settings.  It is known that the cpufreq can be problematic so the
  recommended way forward is to currently revert the cpufreq enablement
  commit

  commit 3949df6ecdca04339bc8a3925c2ba7f881cf82b1
  Author: David Abdurachmanov <david.abdurachma...@sifive.com>
  Date:   Tue Jan 28 02:55:56 2020 -0800

      SiFive Unleashed CPUFreq

  
  == The fix(es) ==

  Revert commit "SiFive Unleashed CPUFreq"

  == Test Case ==

  Boot with the latest DT. It should now boot. Boot without the latest
  DT, it should also boot.

  == Where problems could occur ==

  1. Users expecting CPU freq scaling now don't have this working
  option. This is deemed to be acceptable as without the fix their
  systems are likely to be unbootable with the updated DT.

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